Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35ec96a5f3370c1…

MALICIOUS

PDF

76.3 KB Created: 2021-04-10 16:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 033336cdf5219f24884574e76b710212 SHA-1: c855b9f58724f76abf5d65cb9d6451aa7b12eb3d SHA-256: a35ec96a5f3370c15dd2ad2844d10857191d3de41fd033b27cec7b72aabe8b40
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, suggesting a phishing or scam attempt. The primary URL, 'https://jottigo.ru/strik?utm_term=how+much+is+a+black+wii+worth', is presented as a search result to entice clicks. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/strik?utm_term=how+much+is+a+black+wii+worth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467571/normal_604968f3c7c43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501046/normal_600e126eaada7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_604cc1561e08d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464521/normal_605bdeff21699.pdfIn PDF document text
    • http://tewosube.mypressonline.com/14691761580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_602dca20c2ee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_60286ab99126e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488572/normal_5ffdccd48f18e.pdfIn PDF document text
    • http://cosmeteca.com/how_to_sync_victsing_speakerqs8jh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417990/normal_5fddd323b67b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486969/normal_5fe8b517854b6.pdfIn PDF document text
    • http://thelandofbadideas.com/two_way_frequency_table_worksheet_and_answersek3yz.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/oxford_picture_dictionary_english_urdu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_6048f91ba66a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf58d60-5edc-4e43-9d0f-0a1d17d79b4f/85772747764.pdfIn PDF document text
    • http://zujisofivo.onlinewebshop.net/pdf_to_word_online_job.pdfIn PDF document text
    • http://larovitivejel.atwebpages.com/15786364478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0daf4da-3f3a-45c4-99c8-86c6013592da/connect_directv_to_wifi_hotspot.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 5296 bytes
SHA-256: ab370b7e982c3d9f3ec76ae7f68ba03f636f82c095c27eb8aa0c9347501169a1
font_01_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 11132 bytes
SHA-256: 45f272490d3403e0f42c2bc7f53f5c866081c01a41280d859014d1b9562244e6

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